[yt-svn] commit/yt: 6 new changesets

commits-noreply at bitbucket.org commits-noreply at bitbucket.org
Mon Mar 28 04:59:34 PDT 2016


6 new commits in yt:

https://bitbucket.org/yt_analysis/yt/commits/203154bc2499/
Changeset:   203154bc2499
Branch:      yt
User:        brittonsmith
Date:        2016-03-25 19:02:44+00:00
Summary:     Adding docs for cosmology calculator.
Affected #:  3 files

diff -r a776e67368c5629296b1e365dfca0b68b41ef1d5 -r 203154bc24991ffa08d9de9b6968b68c01c2d3dc doc/source/analyzing/analysis_modules/cosmology_calculator.rst
--- /dev/null
+++ b/doc/source/analyzing/analysis_modules/cosmology_calculator.rst
@@ -0,0 +1,75 @@
+.. _cosmology-calculator:
+
+Cosmology Calculator
+====================
+
+The cosmology calculator can be used to calculate cosmological distances and
+times given a set of cosmological parameters.  A cosmological dataset, `ds`,
+will automatically have a cosmology calculator configured with the correct
+parameters associated with it as `ds.cosmology`.  A standalone
+:class:`~yt.utilities.cosmology.Cosmology` calculator object can be created
+in the following way:
+
+.. code-block:: python
+
+   from yt.utilities.cosmology import Cosmology
+
+   co = Cosmology(hubble_constant=0.7, omega_matter=0.3,
+                  omega_lambda=0.7, omega_curvature=0.0)
+
+Once created, various distance calculations as well as conversions between
+redshift and time are available:
+
+.. notebook-cell::
+
+   from yt.utilities.cosmology import Cosmology
+
+   co = Cosmology(hubble_constant=0.7, omega_matter=0.3,
+                  omega_lambda=0.7, omega_curvature=0.0)
+
+   # Hubble distance (c / h)
+   print co.hubble_distance()
+
+   # distance from z = 0 to 0.5
+   print co.comoving_radial_distance(0, 0.5).in_units("Mpc/h")
+
+   # transverse distance
+   print co.comoving_transverse_distance(0, 0.5).in_units("Mpc/h")
+
+   # comoving volume
+   print co.comoving_volume(0, 0.5).in_units("Gpc**3")
+
+   # angulare diameter distance
+   print co.angular_diamter_distance(0, 0.5).in_units("Mpc/h")
+
+   # angular scale
+   print co.angular_scale(0, 0.5).in_units("Mpc/degree")
+
+   # luminosity distance
+   print co.luminosity_distance(0, 0.5).in_units("Mpc/h")
+
+   # time between two redshifts
+   print co.lookback_time(0, 0.5).in_units("Gyr")
+
+   # age of the Universe at a given redshift
+   print co.hubble_time(0).in_units("Gyr")
+
+   # critical density
+   print co.critical_density(0)
+
+   # Hubble parameter at a given redshift
+   print co.hubble_parameter(0).in_units("km/s/Mpc")
+
+   # convert time after Big Bang to redshift
+   my_t = co.quan(8, "Gyr")
+   print co.z_from_t(my_t)
+
+   # convert redshift to time after Big Bang (same as Hubble time)
+   print co.t_from_z(0.5).in_units("Gyr")
+
+Note, that all distances returned are comoving distances.  All of the above
+functions accept scalar values and arrays.  The helper functions, `co.quan`
+and `co.arr` exist to create unitful `YTQuantities` and `YTArray` with the
+unit registry of the cosmology calculator.  For more information on the usage
+and meaning of each calculation, consult the reference documentation at
+:ref:`cosmology-calculator-ref`.

diff -r a776e67368c5629296b1e365dfca0b68b41ef1d5 -r 203154bc24991ffa08d9de9b6968b68c01c2d3dc doc/source/analyzing/analysis_modules/index.rst
--- a/doc/source/analyzing/analysis_modules/index.rst
+++ b/doc/source/analyzing/analysis_modules/index.rst
@@ -12,6 +12,7 @@
 .. toctree::
    :maxdepth: 2
 
+   cosmology_calculator
    halo_analysis
    synthetic_observation
    exporting

diff -r a776e67368c5629296b1e365dfca0b68b41ef1d5 -r 203154bc24991ffa08d9de9b6968b68c01c2d3dc doc/source/reference/api/api.rst
--- a/doc/source/reference/api/api.rst
+++ b/doc/source/reference/api/api.rst
@@ -861,6 +861,28 @@
    ~yt.utilities.parallel_tools.parallel_analysis_interface.ParallelAnalysisInterface
    ~yt.utilities.parallel_tools.parallel_analysis_interface.ParallelObjectIterator
 
+.. _cosmology-calculator-ref:
+
+Cosmology Calculator
+--------------------
+
+.. autosummary::
+   :toctree: generated/
+
+   ~yt.utilities.cosmology.Cosmology.hubble_distance
+   ~yt.utilities.cosmology.Cosmology.comoving_radial_distance
+   ~yt.utilities.cosmology.Cosmology.comoving_transverse_distance
+   ~yt.utilities.cosmology.Cosmology.comoving_volume
+   ~yt.utilities.cosmology.Cosmology.angular_diameter_distance
+   ~yt.utilities.cosmology.Cosmology.angular_scale
+   ~yt.utilities.cosmology.Cosmology.luminosity_distance
+   ~yt.utilities.cosmology.Cosmology.lookback_time
+   ~yt.utilities.cosmology.Cosmology.hubble_time
+   ~yt.utilities.cosmology.Cosmology.critical_density
+   ~yt.utilities.cosmology.Cosmology.hubble_parameter
+   ~yt.utilities.cosmology.Cosmology.expansion_factor
+   ~yt.utilities.cosmology.Cosmology.z_from_t
+   ~yt.utilities.cosmology.Cosmology.t_from_z
 
 Testing Infrastructure
 ----------------------


https://bitbucket.org/yt_analysis/yt/commits/06fac0b0df7b/
Changeset:   06fac0b0df7b
Branch:      yt
User:        brittonsmith
Date:        2016-03-26 10:40:09+00:00
Summary:     Switching to python3 friendly print.
Affected #:  1 file

diff -r 203154bc24991ffa08d9de9b6968b68c01c2d3dc -r 06fac0b0df7bfd5eaca6a50359e9b4917d77d2dc doc/source/analyzing/analysis_modules/cosmology_calculator.rst
--- a/doc/source/analyzing/analysis_modules/cosmology_calculator.rst
+++ b/doc/source/analyzing/analysis_modules/cosmology_calculator.rst
@@ -28,44 +28,44 @@
                   omega_lambda=0.7, omega_curvature=0.0)
 
    # Hubble distance (c / h)
-   print co.hubble_distance()
+   print(co.hubble_distance())
 
    # distance from z = 0 to 0.5
-   print co.comoving_radial_distance(0, 0.5).in_units("Mpc/h")
+   print(co.comoving_radial_distance(0, 0.5).in_units("Mpc/h"))
 
    # transverse distance
-   print co.comoving_transverse_distance(0, 0.5).in_units("Mpc/h")
+   print(co.comoving_transverse_distance(0, 0.5).in_units("Mpc/h"))
 
    # comoving volume
-   print co.comoving_volume(0, 0.5).in_units("Gpc**3")
+   print(co.comoving_volume(0, 0.5).in_units("Gpc**3"))
 
    # angulare diameter distance
-   print co.angular_diamter_distance(0, 0.5).in_units("Mpc/h")
+   print(co.angular_diamter_distance(0, 0.5).in_units("Mpc/h"))
 
    # angular scale
-   print co.angular_scale(0, 0.5).in_units("Mpc/degree")
+   print(co.angular_scale(0, 0.5).in_units("Mpc/degree"))
 
    # luminosity distance
-   print co.luminosity_distance(0, 0.5).in_units("Mpc/h")
+   print(co.luminosity_distance(0, 0.5).in_units("Mpc/h"))
 
    # time between two redshifts
-   print co.lookback_time(0, 0.5).in_units("Gyr")
+   print(co.lookback_time(0, 0.5).in_units("Gyr"))
 
    # age of the Universe at a given redshift
-   print co.hubble_time(0).in_units("Gyr")
+   print(co.hubble_time(0).in_units("Gyr"))
 
    # critical density
-   print co.critical_density(0)
+   print(co.critical_density(0))
 
    # Hubble parameter at a given redshift
-   print co.hubble_parameter(0).in_units("km/s/Mpc")
+   print(co.hubble_parameter(0).in_units("km/s/Mpc"))
 
    # convert time after Big Bang to redshift
    my_t = co.quan(8, "Gyr")
-   print co.z_from_t(my_t)
+   print(co.z_from_t(my_t))
 
    # convert redshift to time after Big Bang (same as Hubble time)
-   print co.t_from_z(0.5).in_units("Gyr")
+   print(co.t_from_z(0.5).in_units("Gyr"))
 
 Note, that all distances returned are comoving distances.  All of the above
 functions accept scalar values and arrays.  The helper functions, `co.quan`


https://bitbucket.org/yt_analysis/yt/commits/2199af5943c4/
Changeset:   2199af5943c4
Branch:      yt
User:        brittonsmith
Date:        2016-03-26 10:50:07+00:00
Summary:     Updating print statements in docstrings.
Affected #:  1 file

diff -r 06fac0b0df7bfd5eaca6a50359e9b4917d77d2dc -r 2199af5943c40ecdff071c220adaf4cb19f897d1 yt/utilities/cosmology.py
--- a/yt/utilities/cosmology.py
+++ b/yt/utilities/cosmology.py
@@ -4,7 +4,6 @@
 and featuring time and redshift conversion functions from Enzo.
 
 """
-from __future__ import print_function
 
 #-----------------------------------------------------------------------------
 # Copyright (c) 2013-2014, yt Development Team.
@@ -58,7 +57,7 @@
 
     >>> from yt.utilities.cosmology import Cosmology
     >>> co = Cosmology()
-    >>> print co.hubble_time(0.0).in_units("Gyr")
+    >>> print(co.hubble_time(0.0).in_units("Gyr"))
     
     """
     def __init__(self, hubble_constant = 0.71,
@@ -104,8 +103,9 @@
         Examples
         --------
 
+        >>> from yt.utilities.cosmology import Cosmology
         >>> co = Cosmology()
-        >>> print co.comoving_radial_distance(0., 1.).in_units("Mpccm")
+        >>> print(co.comoving_radial_distance(0., 1.).in_units("Mpccm"))
         
         """
         return (self.hubble_distance() *
@@ -127,8 +127,9 @@
         Examples
         --------
 
+        >>> from yt.utilities.cosmology import Cosmology
         >>> co = Cosmology()
-        >>> print co.comoving_transverse_distance(0., 1.).in_units("Mpccm")
+        >>> print(co.comoving_transverse_distance(0., 1.).in_units("Mpccm"))
         
         """
         if (self.omega_curvature > 0):
@@ -161,8 +162,9 @@
         Examples
         --------
 
+        >>> from yt.utilities.cosmology import Cosmology
         >>> co = Cosmology()
-        >>> print co.comoving_volume(0., 1.).in_units("Gpccm**3")
+        >>> print(co.comoving_volume(0., 1.).in_units("Gpccm**3"))
 
         """
         if (self.omega_curvature > 0):
@@ -209,8 +211,9 @@
         Examples
         --------
 
+        >>> from yt.utilities.cosmology import Cosmology
         >>> co = Cosmology()
-        >>> print co.angular_diameter_distance(0., 1.).in_units("Mpc")
+        >>> print(co.angular_diameter_distance(0., 1.).in_units("Mpc"))
         
         """
         
@@ -232,8 +235,9 @@
         Examples
         --------
 
+        >>> from yt.utilities.cosmology import Cosmology
         >>> co = Cosmology()
-        >>> print co.angular_scale(0., 1.).in_units("kpc / arcsec")
+        >>> print(co.angular_scale(0., 1.).in_units("kpc / arcsec"))
         
         """
 
@@ -256,8 +260,9 @@
         Examples
         --------
 
+        >>> from yt.utilities.cosmology import Cosmology
         >>> co = Cosmology()
-        >>> print co.luminosity_distance(0., 1.).in_units("Mpc")
+        >>> print(co.luminosity_distance(0., 1.).in_units("Mpc"))
         
         """
 
@@ -279,8 +284,9 @@
         Examples
         --------
 
+        >>> from yt.utilities.cosmology import Cosmology
         >>> co = Cosmology()
-        >>> print co.lookback_time(0., 1.).in_units("Gyr")
+        >>> print(co.lookback_time(0., 1.).in_units("Gyr"))
 
         """
         return (trapzint(self.age_integrand, z_i, z_f) / \
@@ -301,8 +307,9 @@
         Examples
         --------
 
+        >>> from yt.utilities.cosmology import Cosmology
         >>> co = Cosmology()
-        >>> print co.hubble_time(0.).in_units("Gyr")
+        >>> print(co.hubble_time(0.).in_units("Gyr"))
 
         See Also
         --------
@@ -326,9 +333,10 @@
         Examples
         --------
 
+        >>> from yt.utilities.cosmology import Cosmology
         >>> co = Cosmology()
-        >>> print co.critical_density(0.).in_units("g/cm**3")
-        >>> print co.critical_density(0).in_units("Msun/Mpc**3")
+        >>> print(co.critical_density(0.).in_units("g/cm**3"))
+        >>> print(co.critical_density(0).in_units("Msun/Mpc**3"))
         
         """
         return (3.0 / 8.0 / np.pi * 
@@ -348,8 +356,9 @@
         Examples
         --------
 
+        >>> from yt.utilities.cosmology import Cosmology
         >>> co = Cosmology()
-        >>> print co.hubble_parameter(1.0).in_units("km/s/Mpc")
+        >>> print(co.hubble_parameter(1.0).in_units("km/s/Mpc"))
 
         """
         return self.hubble_constant.in_base(self.unit_system) * self.expansion_factor(z)
@@ -393,8 +402,9 @@
         Examples
         --------
 
+        >>> from yt.utilities.cosmology import Cosmology
         >>> co = Cosmology()
-        >>> print co.z_from_t(4.e17)
+        >>> print(co.z_from_t(4.e17))
 
         """
 
@@ -484,8 +494,9 @@
         Examples
         --------
 
+        >>> from yt.utilities.cosmology import Cosmology
         >>> co = Cosmology()
-        >>> print co.t_from_z(0.).in_units("Gyr")
+        >>> print(co.t_from_z(0.).in_units("Gyr"))
 
         See Also
         --------


https://bitbucket.org/yt_analysis/yt/commits/fa3b86f5924d/
Changeset:   fa3b86f5924d
Branch:      yt
User:        brittonsmith
Date:        2016-03-26 10:51:42+00:00
Summary:     Forgot to add Cosmology class to api docs.
Affected #:  1 file

diff -r 2199af5943c40ecdff071c220adaf4cb19f897d1 -r fa3b86f5924da51cf58f3e5e750ada49a8d5a48f doc/source/reference/api/api.rst
--- a/doc/source/reference/api/api.rst
+++ b/doc/source/reference/api/api.rst
@@ -869,6 +869,7 @@
 .. autosummary::
    :toctree: generated/
 
+   ~yt.utilities.cosmology.Cosmology
    ~yt.utilities.cosmology.Cosmology.hubble_distance
    ~yt.utilities.cosmology.Cosmology.comoving_radial_distance
    ~yt.utilities.cosmology.Cosmology.comoving_transverse_distance


https://bitbucket.org/yt_analysis/yt/commits/bd723b804527/
Changeset:   bd723b804527
Branch:      yt
User:        brittonsmith
Date:        2016-03-26 18:46:01+00:00
Summary:     Adding to print statements in docs.
Affected #:  1 file

diff -r fa3b86f5924da51cf58f3e5e750ada49a8d5a48f -r bd723b804527489ab5ff410d9d1f4acf9e25b1c0 doc/source/analyzing/analysis_modules/cosmology_calculator.rst
--- a/doc/source/analyzing/analysis_modules/cosmology_calculator.rst
+++ b/doc/source/analyzing/analysis_modules/cosmology_calculator.rst
@@ -28,44 +28,44 @@
                   omega_lambda=0.7, omega_curvature=0.0)
 
    # Hubble distance (c / h)
-   print(co.hubble_distance())
+   print("hubble distance", co.hubble_distance())
 
    # distance from z = 0 to 0.5
-   print(co.comoving_radial_distance(0, 0.5).in_units("Mpc/h"))
+   print("comoving radial distance", co.comoving_radial_distance(0, 0.5).in_units("Mpc/h"))
 
    # transverse distance
-   print(co.comoving_transverse_distance(0, 0.5).in_units("Mpc/h"))
+   print("transverse distance", co.comoving_transverse_distance(0, 0.5).in_units("Mpc/h"))
 
    # comoving volume
-   print(co.comoving_volume(0, 0.5).in_units("Gpc**3"))
+   print("comoving volume", co.comoving_volume(0, 0.5).in_units("Gpc**3"))
 
    # angulare diameter distance
-   print(co.angular_diamter_distance(0, 0.5).in_units("Mpc/h"))
+   print("angular diameter distance", co.angular_diameter_distance(0, 0.5).in_units("Mpc/h"))
 
    # angular scale
-   print(co.angular_scale(0, 0.5).in_units("Mpc/degree"))
+   print("angular scale", co.angular_scale(0, 0.5).in_units("Mpc/degree"))
 
    # luminosity distance
-   print(co.luminosity_distance(0, 0.5).in_units("Mpc/h"))
+   print("luminosity distance", co.luminosity_distance(0, 0.5).in_units("Mpc/h"))
 
    # time between two redshifts
-   print(co.lookback_time(0, 0.5).in_units("Gyr"))
+   print("lookback time", co.lookback_time(0, 0.5).in_units("Gyr"))
 
    # age of the Universe at a given redshift
-   print(co.hubble_time(0).in_units("Gyr"))
+   print("hubble time", co.hubble_time(0).in_units("Gyr"))
 
    # critical density
-   print(co.critical_density(0))
+   print("critical density", co.critical_density(0))
 
    # Hubble parameter at a given redshift
-   print(co.hubble_parameter(0).in_units("km/s/Mpc"))
+   print("hubble parameter", co.hubble_parameter(0).in_units("km/s/Mpc"))
 
    # convert time after Big Bang to redshift
    my_t = co.quan(8, "Gyr")
-   print(co.z_from_t(my_t))
+   print("z from t", co.z_from_t(my_t))
 
    # convert redshift to time after Big Bang (same as Hubble time)
-   print(co.t_from_z(0.5).in_units("Gyr"))
+   print("t from z", co.t_from_z(0.5).in_units("Gyr"))
 
 Note, that all distances returned are comoving distances.  All of the above
 functions accept scalar values and arrays.  The helper functions, `co.quan`


https://bitbucket.org/yt_analysis/yt/commits/c956b4087291/
Changeset:   c956b4087291
Branch:      yt
User:        xarthisius
Date:        2016-03-28 11:59:23+00:00
Summary:     Merged in brittonsmith/yt (pull request #2084)

Adding docs for cosmology calculator. (closes Issue #760)
Affected #:  4 files

diff -r fbf09b0618e08deb4f675c82b61e816d8f17156a -r c956b4087291b6717fd870f09c9fd5176057d1f6 doc/source/analyzing/analysis_modules/cosmology_calculator.rst
--- /dev/null
+++ b/doc/source/analyzing/analysis_modules/cosmology_calculator.rst
@@ -0,0 +1,75 @@
+.. _cosmology-calculator:
+
+Cosmology Calculator
+====================
+
+The cosmology calculator can be used to calculate cosmological distances and
+times given a set of cosmological parameters.  A cosmological dataset, `ds`,
+will automatically have a cosmology calculator configured with the correct
+parameters associated with it as `ds.cosmology`.  A standalone
+:class:`~yt.utilities.cosmology.Cosmology` calculator object can be created
+in the following way:
+
+.. code-block:: python
+
+   from yt.utilities.cosmology import Cosmology
+
+   co = Cosmology(hubble_constant=0.7, omega_matter=0.3,
+                  omega_lambda=0.7, omega_curvature=0.0)
+
+Once created, various distance calculations as well as conversions between
+redshift and time are available:
+
+.. notebook-cell::
+
+   from yt.utilities.cosmology import Cosmology
+
+   co = Cosmology(hubble_constant=0.7, omega_matter=0.3,
+                  omega_lambda=0.7, omega_curvature=0.0)
+
+   # Hubble distance (c / h)
+   print("hubble distance", co.hubble_distance())
+
+   # distance from z = 0 to 0.5
+   print("comoving radial distance", co.comoving_radial_distance(0, 0.5).in_units("Mpc/h"))
+
+   # transverse distance
+   print("transverse distance", co.comoving_transverse_distance(0, 0.5).in_units("Mpc/h"))
+
+   # comoving volume
+   print("comoving volume", co.comoving_volume(0, 0.5).in_units("Gpc**3"))
+
+   # angulare diameter distance
+   print("angular diameter distance", co.angular_diameter_distance(0, 0.5).in_units("Mpc/h"))
+
+   # angular scale
+   print("angular scale", co.angular_scale(0, 0.5).in_units("Mpc/degree"))
+
+   # luminosity distance
+   print("luminosity distance", co.luminosity_distance(0, 0.5).in_units("Mpc/h"))
+
+   # time between two redshifts
+   print("lookback time", co.lookback_time(0, 0.5).in_units("Gyr"))
+
+   # age of the Universe at a given redshift
+   print("hubble time", co.hubble_time(0).in_units("Gyr"))
+
+   # critical density
+   print("critical density", co.critical_density(0))
+
+   # Hubble parameter at a given redshift
+   print("hubble parameter", co.hubble_parameter(0).in_units("km/s/Mpc"))
+
+   # convert time after Big Bang to redshift
+   my_t = co.quan(8, "Gyr")
+   print("z from t", co.z_from_t(my_t))
+
+   # convert redshift to time after Big Bang (same as Hubble time)
+   print("t from z", co.t_from_z(0.5).in_units("Gyr"))
+
+Note, that all distances returned are comoving distances.  All of the above
+functions accept scalar values and arrays.  The helper functions, `co.quan`
+and `co.arr` exist to create unitful `YTQuantities` and `YTArray` with the
+unit registry of the cosmology calculator.  For more information on the usage
+and meaning of each calculation, consult the reference documentation at
+:ref:`cosmology-calculator-ref`.

diff -r fbf09b0618e08deb4f675c82b61e816d8f17156a -r c956b4087291b6717fd870f09c9fd5176057d1f6 doc/source/analyzing/analysis_modules/index.rst
--- a/doc/source/analyzing/analysis_modules/index.rst
+++ b/doc/source/analyzing/analysis_modules/index.rst
@@ -12,6 +12,7 @@
 .. toctree::
    :maxdepth: 2
 
+   cosmology_calculator
    halo_analysis
    synthetic_observation
    exporting

diff -r fbf09b0618e08deb4f675c82b61e816d8f17156a -r c956b4087291b6717fd870f09c9fd5176057d1f6 doc/source/reference/api/api.rst
--- a/doc/source/reference/api/api.rst
+++ b/doc/source/reference/api/api.rst
@@ -862,6 +862,29 @@
    ~yt.utilities.parallel_tools.parallel_analysis_interface.ParallelAnalysisInterface
    ~yt.utilities.parallel_tools.parallel_analysis_interface.ParallelObjectIterator
 
+.. _cosmology-calculator-ref:
+
+Cosmology Calculator
+--------------------
+
+.. autosummary::
+   :toctree: generated/
+
+   ~yt.utilities.cosmology.Cosmology
+   ~yt.utilities.cosmology.Cosmology.hubble_distance
+   ~yt.utilities.cosmology.Cosmology.comoving_radial_distance
+   ~yt.utilities.cosmology.Cosmology.comoving_transverse_distance
+   ~yt.utilities.cosmology.Cosmology.comoving_volume
+   ~yt.utilities.cosmology.Cosmology.angular_diameter_distance
+   ~yt.utilities.cosmology.Cosmology.angular_scale
+   ~yt.utilities.cosmology.Cosmology.luminosity_distance
+   ~yt.utilities.cosmology.Cosmology.lookback_time
+   ~yt.utilities.cosmology.Cosmology.hubble_time
+   ~yt.utilities.cosmology.Cosmology.critical_density
+   ~yt.utilities.cosmology.Cosmology.hubble_parameter
+   ~yt.utilities.cosmology.Cosmology.expansion_factor
+   ~yt.utilities.cosmology.Cosmology.z_from_t
+   ~yt.utilities.cosmology.Cosmology.t_from_z
 
 Testing Infrastructure
 ----------------------

diff -r fbf09b0618e08deb4f675c82b61e816d8f17156a -r c956b4087291b6717fd870f09c9fd5176057d1f6 yt/utilities/cosmology.py
--- a/yt/utilities/cosmology.py
+++ b/yt/utilities/cosmology.py
@@ -4,7 +4,6 @@
 and featuring time and redshift conversion functions from Enzo.
 
 """
-from __future__ import print_function
 
 #-----------------------------------------------------------------------------
 # Copyright (c) 2013-2014, yt Development Team.
@@ -58,7 +57,7 @@
 
     >>> from yt.utilities.cosmology import Cosmology
     >>> co = Cosmology()
-    >>> print co.hubble_time(0.0).in_units("Gyr")
+    >>> print(co.hubble_time(0.0).in_units("Gyr"))
     
     """
     def __init__(self, hubble_constant = 0.71,
@@ -104,8 +103,9 @@
         Examples
         --------
 
+        >>> from yt.utilities.cosmology import Cosmology
         >>> co = Cosmology()
-        >>> print co.comoving_radial_distance(0., 1.).in_units("Mpccm")
+        >>> print(co.comoving_radial_distance(0., 1.).in_units("Mpccm"))
         
         """
         return (self.hubble_distance() *
@@ -127,8 +127,9 @@
         Examples
         --------
 
+        >>> from yt.utilities.cosmology import Cosmology
         >>> co = Cosmology()
-        >>> print co.comoving_transverse_distance(0., 1.).in_units("Mpccm")
+        >>> print(co.comoving_transverse_distance(0., 1.).in_units("Mpccm"))
         
         """
         if (self.omega_curvature > 0):
@@ -161,8 +162,9 @@
         Examples
         --------
 
+        >>> from yt.utilities.cosmology import Cosmology
         >>> co = Cosmology()
-        >>> print co.comoving_volume(0., 1.).in_units("Gpccm**3")
+        >>> print(co.comoving_volume(0., 1.).in_units("Gpccm**3"))
 
         """
         if (self.omega_curvature > 0):
@@ -209,8 +211,9 @@
         Examples
         --------
 
+        >>> from yt.utilities.cosmology import Cosmology
         >>> co = Cosmology()
-        >>> print co.angular_diameter_distance(0., 1.).in_units("Mpc")
+        >>> print(co.angular_diameter_distance(0., 1.).in_units("Mpc"))
         
         """
         
@@ -232,8 +235,9 @@
         Examples
         --------
 
+        >>> from yt.utilities.cosmology import Cosmology
         >>> co = Cosmology()
-        >>> print co.angular_scale(0., 1.).in_units("kpc / arcsec")
+        >>> print(co.angular_scale(0., 1.).in_units("kpc / arcsec"))
         
         """
 
@@ -256,8 +260,9 @@
         Examples
         --------
 
+        >>> from yt.utilities.cosmology import Cosmology
         >>> co = Cosmology()
-        >>> print co.luminosity_distance(0., 1.).in_units("Mpc")
+        >>> print(co.luminosity_distance(0., 1.).in_units("Mpc"))
         
         """
 
@@ -279,8 +284,9 @@
         Examples
         --------
 
+        >>> from yt.utilities.cosmology import Cosmology
         >>> co = Cosmology()
-        >>> print co.lookback_time(0., 1.).in_units("Gyr")
+        >>> print(co.lookback_time(0., 1.).in_units("Gyr"))
 
         """
         return (trapzint(self.age_integrand, z_i, z_f) / \
@@ -301,8 +307,9 @@
         Examples
         --------
 
+        >>> from yt.utilities.cosmology import Cosmology
         >>> co = Cosmology()
-        >>> print co.hubble_time(0.).in_units("Gyr")
+        >>> print(co.hubble_time(0.).in_units("Gyr"))
 
         See Also
         --------
@@ -326,9 +333,10 @@
         Examples
         --------
 
+        >>> from yt.utilities.cosmology import Cosmology
         >>> co = Cosmology()
-        >>> print co.critical_density(0.).in_units("g/cm**3")
-        >>> print co.critical_density(0).in_units("Msun/Mpc**3")
+        >>> print(co.critical_density(0.).in_units("g/cm**3"))
+        >>> print(co.critical_density(0).in_units("Msun/Mpc**3"))
         
         """
         return (3.0 / 8.0 / np.pi * 
@@ -348,8 +356,9 @@
         Examples
         --------
 
+        >>> from yt.utilities.cosmology import Cosmology
         >>> co = Cosmology()
-        >>> print co.hubble_parameter(1.0).in_units("km/s/Mpc")
+        >>> print(co.hubble_parameter(1.0).in_units("km/s/Mpc"))
 
         """
         return self.hubble_constant.in_base(self.unit_system) * self.expansion_factor(z)
@@ -393,8 +402,9 @@
         Examples
         --------
 
+        >>> from yt.utilities.cosmology import Cosmology
         >>> co = Cosmology()
-        >>> print co.z_from_t(4.e17)
+        >>> print(co.z_from_t(4.e17))
 
         """
 
@@ -484,8 +494,9 @@
         Examples
         --------
 
+        >>> from yt.utilities.cosmology import Cosmology
         >>> co = Cosmology()
-        >>> print co.t_from_z(0.).in_units("Gyr")
+        >>> print(co.t_from_z(0.).in_units("Gyr"))
 
         See Also
         --------

Repository URL: https://bitbucket.org/yt_analysis/yt/

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